So it's all go on Wednesday night then for Chelsea vs Arsenal in the same competition?

Yes. Absolutely - and this time expect a few more controversial moments than on Monday night as then stakes are higher so close to a day out at Wembley.

What can the team in Uxbridge see?

They have access to every camera angle, plus the four goal decision system cameras. Crucially, they won’t see what broadcasters show – replays etc – so will remain uninfluenced by anything external to what they see on those camera angles.

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What incidents can a VAR intervene for?

Goals, red cards, penalties and mistaken identity. Just that.

How are incidents reviewed?

The VAR can inform the referee there has been a factual error that does not require the referee to see the video, like a goal being scored from an offside position.

The second is the on-field review where the VAR advises the referee to re-watch footage on a pitch-side monitor and reconsider their decision.

In both cases the referee will make a TV signal gesture before communicating the final decision.